Effect of different nitrogen and sulfur levels on yield, yield Components and Some Quality Characteristics

In order to investigate the effect of nitrogen and sulfur on quantitative and qualitative yield of rapeseed, a factorial experiment was conducted in a randomized complete block design with three replications in Research Field of Shastklateh Forest of Gorgan in 2018. Four amounts of nitrogen fertilizer 25, 50, 75 and 100 kg of pure nitrogen per hectare (from urea source) as the first factor, two amounts of sulfur fertilizer to zero (control) and 200 kg / ha as the second factor and two spring rapeseed genotypes Hyola 50 hybrid and ARGS 003 were selected as the third factor. The results showed that biological yield, grain yield, 1000-grain weight, number of pods per square meter, number of seeds per pod, protein percentage and oil percentage were affected by cultivar, nitrogen and sulfur. Comparison of the average interactions of nitrogen and cultivar showed that biological yield (8360 kg/ha), grain yield (275.6 g/m2), 1000-grain weight (4.1 g), number of pods per square meter (5323.53), Number of seeds per pod (31.64) and grain protein (24.32%), Soluble sugar (33.35 μmol/g) and total chlorophyll (1.38 mg/g) at the level of 100 kg N/ha and Hyola 50 hybrid cultivars and the highest grain oil (41.65%) at the level of 75 kg N and hybrid cultivars Monsters 50 were observed. Also, the comparison of the mean of the interaction of sulfur and cultivar showed that the highest number of latere better ability to absorb and transfer nitrogen and sulfur and therefore produce more yield.